Anyone who changes their lifestyle in any way solely to avoid polluting is not acting rationally. Sadly, most of the cost of driving a car is not born by the driver. Until there's some kind of carbon tax (hint: never) you can't expect people to act against their own interests. Capitalism works, even if the incentives are toward destroying the planet.
I just drove to Seattle and back this weekend in a Honda Civic. It cost me about 40 bucks in gas. God knows how many hundreds (thousands?) of dollars worth of damage I did to 1-5 and the air. And knowing that, I still didn't take the train or buy a Tesla.